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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
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** accordance with the commercial license agreement provided with the
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** information use the contact form at https://www.qt.io/contact-us.
**
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** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
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****************************************************************************/
/*!
\page widgets-changes-qt6.html
\title Changes to Qt Widgets
\ingroup changes-qt-5-to-6
\brief Migrate Qt Widgets to Qt 6.
Qt 6 is a result of the conscious effort to make the framework more
efficient and easy to use.
We try to maintain binary and source compatibility for all the public
APIs in each release. But some changes were inevitable in an effort to
make Qt a better framework.
In this topic we summarize those changes in Qt Widgets, and provide
guidance to handle them.
\section1 Kernel classes
\section2 The QWidget class
The virtual QWidget::enterEvent() handler now receives a QEnterEvent*
parameter which has information about the pointer position, rather than
a plain QEvent*.
\section2 QDesktopWidget and QApplication::desktop()
QDesktopWidget was already deprecated in Qt 5, and has been removed in
Qt 6, together with QApplication::desktop().
QScreen provides equivalent functionality to query for information about
available screens, screen that form a virtual desktop, and screen
geometries.
Use QWidget::setScreen() to create a QWidget on a specific display;
note that this does not move a widget to a screen in a virtual desktop
setup.
\section2 QAction, QActionGroup
These classes have been moved into the QtGui module. Member functions that
depend on types defined in QtWidgets (such as QAction::menu() and
QAction::setMenu()) are implemented as templates that will be instantiated
only when called.
\section1 Widgets
\section2 The QAbstractButton class
The default timeout parameter for QAbstractButton::animateClick() is
removed to allow modern connection syntax without the need for qOverload.
\section2 The QComboBox class
The QComboBox::setModel() function is now virtual.
\section1 ItemViews
\section2 The QAbstractItemView class
The virtual viewOptions() method that previously returned a QStyleOptionViewItem
object has been renamed to initViewItemOption, and initializes a
QStyleOptionViewItem object that's passed in through a pointer.
\section1 Styling Classes and related APIs
All versioned QStyleOption subclasses are consolidated, and the version
numbers are reset to 1.
The various initStyleOption() methods in widget classes are now virtual.
\section1 Utility Classes
\section2 QUndoCommand, QUndoStack, and QUndoGroup
The widget independent classes of the Undo/Redo framework have been moved
into the QtGui module.
*/
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